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reddish-brown where thinner
Chips shown are fired vertically on a white clay body fired to cone 6 oxidation and cone 10 reduction
Samples are shown at Cone 5
Gray variation turns blue
Cone 10: Color darkens
Utrox Extra (Zircon) Midfire reddish-brown where thinnerZrSiO4. Zirconium silicate. Zircon. A purified, micronized glaze opacifier. 10% 15% Ultrox Extra added to most clear glazes produces a good white. Add to coloured glazes to make opaque pastels. It can be used in recipes calling for Zircopax, Superpax, etc. (alternate brands and grades differ somewhat in effective opacifying power depending on how finely ground they are; Ultrox Extra is a slightly more effective opacifier than Ultrox 500W). For more
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